On this page we offer you software developed at ISFH for download.

DAIDALOS (free of charge according to license agreement)

Daidalos is a ray tracing framework developed for the purpose of simulating the optical properties of photovoltaic (PV) modules in their environment. It enables many different applications across seven orders of magnitude in size from ray tracing of building facades to ray tracing of solar cell texture elements. Daidalos-Cloud is the online version of Daidalos. Using the Daidalos-Cloud web interface, you can adjust the PV module simulation properties via 79 parameters and download the results for your own use.

More info on Daidalos-Cloud

Try Daidalos-Cloud yourself today

TRNSYS Types (free of charge according to license agreement)

ISFH components for thermal system simulation with TRNSYS

ISFH has developed a series of components for the representation of thermal and electrical system technology for the simulation environment TRNSYS. We provide a selection of the generated types free of charge.

How do I get such a type? Please download the respective license agreement and fax it filled out with your e-mail address to 05151-999-500 or send it to . We will then email you the type.

TRNSYS-Type 203 for uncovered PVT collectors
The PVT collector type 203 describes the thermal and electrical behaviour of uncovered PVT collectors and was developed in the BiSolar-WP project. The parameterisation is carried out exclusively via characteristic data of common standards for PV modules or solar thermal collectors.

Licence agreement type 203
TRNSYS-Type 708 as a casing for buried storages
Type 708 describes the thermal behaviour of the surrounding soil of buried storages and was developed in the project KES (small buried storages).

Licence agreement type 708
TRNSYS-Type 292 as volume flow correction for heat pump types with characteristic diagram
Type 292 performs a volume flow correction for heat pumps with characteristic diagram and was developed in the Geo-Solar-WP project.

Licence agreement type 292
TRNSYS-Type 204 for oil or gas boilers
Der Type 204 calculates the transient behaviour of oil and gas boilers and was developed in the WE-Sim project.

Licence agreement type 204

SCAN - Solar cell analysis (for a fee)

SCAN (Solar Cell Analysis) is a computer software that analyzes measurement data from wafer-based crystalline silicon solar cells. In addition to widely used analysis methods such as the evaluation of the current-voltage characteristic (IV), the quantum efficiency (QE) and the reflection or capacitance-voltage measurement (CV), image-based evaluation methods such as the determination of the local series resistance (EL/PL) or the local shunt resistance (LIT) are also available.

SCAN requires a Windows-based computer (Windows XP or higher) and runs on all desktop PCs as well as laptops. It is tested and used within ISFH. SCAN has been developed and continuously improved since 2007.

SCAN is now available for purchase Please contact Dr. Karsten Bothe for more information and a quote.

General informationen

  •  Integrated analysis approach
  • Goal: “All-in-one” analysis software for photovoltaic measurement data
  • Standard analysis methods as well as new camera-based techniques
  • Particularly suitable for wafer-based silicon solar cells
  • Import of many different file types possible
  • Easy handling and display of images
  • Many different analysis techniques available!


Characteristic curves (IV) analysis tool

  • Combined evaluation of light, dark and JscVoc characteristic curves
  • Automatic Fit Procedure
  • Parameters such as η, Vmpp, Impp, Voc, Isc, FF, Rser, Rsh, J01 and J02 are extracted
  • Integrated simulation of the characteristic curve with certain parameters enables visual “feedback
  • Batch evaluation with pre-defined rules


Quantum efficiency (QE) analysis tool

  • Evaluation of quantum efficiency spectra (EQE, IQE & Refl)
  • Simultaneous fitting of optical and electrical parameters
  • Modelling of emitter, base and substrate regions
  • Consideration of Free Carrier Absorption (FCA) for emitter, base and Back Surface Field (BSF)
  • Absorption modelling in Anti-Reflection-Coating (ARC)
  • Complete modeling of a homogeneously doped emitter


Images of the local series resistance

  • Determines the local series resistance and the local voltage from EL and/or PL images
  • Different methods available
  • Easy data selection and image analysis


Possible extensions

  • Injection-dependent analysis of the minority carrier lifetime
  • Evaluation of capacitance-voltage characteristic curves for determining the base doping and for characterizing the front-side texture
  • SR-LBIC ( spectrally resolved light-beam induced current )
  • LIT (Lock-in thermography) shunt and power loss analysis
  • Camera-based lifetime measurements (PCPLI & Dynamic ILM)
  • Please also ask for evaluation routines implemented especially for you!

SEGA GUI (free of charge according to license agreement)

In the research of industrial silicon solar cells the gap to the theoretical efficiency limit of about 29% closes gradually. State-of-the-art industrial PERC cells achieve efficiencies around 22% leaving only 7% efficiency improvement potential. Closing this gap further is a challenging task for cell developers. The identification of the most promising cell properties for the further research is an important aspect of the development process. The SEGA-GUI, which can be downloaded below, addresses this task by enabling researchers to perform synergistic efficiency gain analyses (SEGA) without any programming knowledge and on short timescales. Here the solar cell is simulated one time with the parameter as in a reference simulation and one time with the parameter idealized. The difference of the energy conversion efficiencies is the improvement potential due to this parameter. This approach also enables the analysis of synergistic effects between different loss channels. Also partly deactivated loss channels can be analyzed. The input required for performing a SEGA is a set of easily measurable cell properties including resistances and recombination currents. The optical properties of the cell can be determined from a measured reflectance spectrum.

The tool can be downloaded free of charge from the following link:

SpiceGUI (Registration necessary, no further development)


The SpiceGUI is a simulation tool for modeling solar cells with equivalent circuit diagrams. It was developed at ISFH by Stefan Eidelloth. The source code is freely available, there is no further development of the software by ISFH.

We would like to have contact to the users of our software and a voluntary registration unfortunately did not work. Therefore the installation files are protected with a password.

To receive the password please send a short e-mail with the subject “Password”, your name & organisation to .

Please install LTspice and Octave3.6.2 (or Matlab) before installing SpiceGUI. The Octave-Forge packages must be installed during the Octave installation. Installation instructions can be found in the help file. The software is no longer supported. The GUI works with the versions “Windows XP, Service Pack 3”, “LTSpice4.23h” and “Octave3.6.2”.

Bitte installieren Sie  und  (oder Matlab) vor der SpiceGUI-Installation. Während der Octave-Installation müssen die Octave-Forge-Pakete mit installiert werden. Eine Installationsanleitung finden Sie in der Hilfedatei. Die Software wird nicht mehr unterstützt. Die GUI funktioniert mit den Versionen “Windows XP, Service Pack 3”, “LTSpice4.23h” und “Octave3.6.2.”.

SpiceGUI Documentation
Windows – Installer
Literatur Simulation tool for equivalent circuit modeling of photovoltaic devices, S. Eidelloth, F. Haase, R. Brendel, Photovoltaics, IEEE Journal of , vol.PP, no.99, doi: 10.1109/JPHOTOV.2012.2187774

CoBoGUI (Registration necessary, no further development)


CoBoGUI (Conductive-Boundary-model Graphical User Interface) is a collection of MATLAB functions for the two-dimensional simulation of solar cells based on COMSOL Multiphysics. CoBoGUI was developed at ISFH by Stefan Eidelloth and Ulrich Eitner. The source code is freely available.

We would like to have contact to the users of our software and a voluntary registration unfortunately did not work. Therefore we have provided the installation files with a password.

To receive the password please send a short e-mail with the subject “Password”, your name & organization to .

The software is no longer supported. The GUI works with the versions “Windows XP, Service Pack 3”, “MATLAB R2010a”, “Comsol 3.5a”, “Comsol 4.1, alpha” and “Comsol 4.2a, alpha.

Windows – Installer (for Comsol-Version 3.5a)
CoBoGUI (Comsol-Version 3.5a)
Windows – Installer (for Comsol-Version 4.1, Alpha-Status)
CoBoGUI (Comsol-Version 4.1, Alpha-Status)
Windows – Installer (Comsol-Version 4.2a, Alpha-Status)
CoBoGUI (Comsol-Version 4.2a, Alpha-Status)
CoBoGUI (Documentation)
Other unit cells
CoBoGUI unit cells

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